File: Shaft Couplings Straight.STL Name: Shaft Coupling - Metric - Straight Material: 18.17 grams ( 0.04 lbs) Infill = 12% Size: 98.2 mm (3.866") x 21.76 mm (.857") x 30 mm (1.181") Resolution: 0.20mm Layers: 156 layers Rafts: Yes Supports: No Print Time: 2 hr 19 min Function: Prints a set of four couplings to connect 3mm, 4mm, 5mm, and 6mm shafts together. Each couple requires two M3 x 12 screws and M3 nuts to squeeze each end of the coupling to its shaft. If you don't need all four, simply print the size you need. These couplings will take a surprising amount of axial misalignment inclduing offset and angular. Each end of the coupling has the size engraved into the surface.